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Hi Brian! Thanks for you comment and others you have posted recently. Your comment about the control spindle thread is interesting, good skills needed to turn a three-start! Just so that others may be not be confused, the hand control valves used in the pictures above were lapped spindle, three position, type, and did not have the thread you described. I have attached a URL of a baler that shows three, hand wheel-type, valves: -
http://fieldingandplatthistory.org.uk/page_id__627.aspx?path=0p3p79p80p
I think that these would have been the type to which you referred. John B
I turned the control spindles for manual operation. They had a 3 start square form thread. To test if the thread was right by holding the shaft on its housing and letting the housing run down the thread it ran down one turn to travel full length of shaft!
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